inverse RIAA + groove question

[Tape27]

hi guys

been seeing a graphic of grooves where they point out different ones, with inverse RIAA curve, without and something else (couldnt find it anymore would have attached it otherwise)

now i was wondering about a few things.. so i cut with a t560, bypassed the main unit and go directly to the cutteramp with my DAW out, i mapped the frequency response so i get a flat signal after A/Bing the cut, im really happy with the results. the record needle goes thru a phono amp with build in RIAA curve. As i see it after flatening the EQ the inverse RIAA should already be in there ? i dont need another inverse curve in the chain? just need someone that can help me with the thought process at this point as im not 100% sure… would appreciate

the second question - can grooves be to wide? does ut affect the sound? i know it will when it enters near the middle of the record but before that? i read a blog post about this but was not really shure about the physics so maybe someone can explain

thanks in advance, really appreciate any input

kindly

[spinnertownblanks]

If you map a VR head which has tweeters as drivers, that EQ curve will be your ‘iRIAA’ curve. You don’t need another one separately. This is one of the things using a head with tweeters vs a head with transducers, rather an a simple iRIAA curve with some tweaks, it’s quite a major adjustment, but it gets the job done.

So in short, if you’ve fully mapped your head, that’s all you need. We have a blog post on our site with full info on this exact thing if needed.

Grooves can definitely be too wide especially when cutting plastic. Groove width and depth are directly related. We measure groove width to know the depth. To keep it simple, try to cut with a groove width of 50 to 70 microns.

[Tape27]

thank you, gonna check the blog post of the iRIAA curve!
makes sense to me

regarding groove width and depth - i dont quite jnderstand why it would be bad for the sound if the grooves are too wide, i read the post about that you made already but it doesnt really click in that topic , the information will not be distorted if they are more „floaty“ right?

[spinnertownblanks]

Deep (wide) groove won’t necessarily sound bad. It’s more to do with cutting plastic which is way harder than lacquer discs and can significantly cause more stylus wear of damage.

How wide are we talking? Do you have any measurements? Any pictures?